Add e2e tests for updatable shared libs

Just adding the tests now, not making them run yet.

Test: atest UpdatableSharedLibsTest
Bug: 191978330
Ignore-AOSP-First: logic under test is only available in internal master

Change-Id: I48e8b9422c8703cd4cec6552e0dcfd3b82021816

javatests/com/android/modules/updatablesharedlibs/Android.bp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+java_test_host {
+    name: "UpdatableSharedLibsTest",
+    srcs: [
+        "UpdatableSharedLibsTest.java"
+    ],
+    libs: ["tradefed"],
+    java_resources: [
+        ":test_com.android.modules.updatablesharedlibs",
+    ],
+    data: [
+        ":com.android.modules.updatablesharedlibs.apps.targetS",
+        ":com.android.modules.updatablesharedlibs.apps.targetT",
+        ":com.android.modules.updatablesharedlibs.apps.targetTWithLib",
+    ],
+    static_libs: [
+        "compatibility-host-util",
+        "cts-install-lib-host",
+        "frameworks-base-hostutils",
+        "truth-prebuilt"
+    ],
+}

javatests/com/android/modules/updatablesharedlibs/OWNERS

@@ -0,0 +1,5 @@
+# Mainline modularization team
+
+andreionea@google.com
+pedroql@google.com
+satayev@google.com

javatests/com/android/modules/updatablesharedlibs/UpdatableSharedLibsTest.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.modules.updatablesharedlibs;
+
+import static org.junit.Assume.assumeTrue;
+
+import com.android.internal.util.test.SystemPreparer;
+import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;
+import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.RuleChain;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+
+import android.cts.install.lib.host.InstallUtilsHost;
+
+@RunWith(DeviceJUnit4ClassRunner.class)
+public class UpdatableSharedLibsTest extends BaseHostJUnit4Test {
+
+    private final InstallUtilsHost mHostUtils = new InstallUtilsHost(this);
+    private final TemporaryFolder mTemporaryFolder = new TemporaryFolder();
+    private final SystemPreparer mPreparer = new SystemPreparer(mTemporaryFolder, this::getDevice);
+
+    @Rule
+    public final RuleChain ruleChain = RuleChain.outerRule(mTemporaryFolder).around(mPreparer);
+
+    @Test
+    public void callOnDeviceApiFromHost() throws Exception {
+        if (!getDevice().isAdbRoot()) {
+            getDevice().enableAdbRoot();
+        }
+        assumeTrue("Device does not support updating APEX", mHostUtils.isApexUpdateSupported());
+        assumeTrue("Device requires root", getDevice().isAdbRoot());
+
+        String apex = "test_com.android.modules.updatablesharedlibs.apex";
+        mPreparer.pushResourceFile(apex, "/system/apex/" + apex);
+        mPreparer.reboot();
+        getDevice().disableAdbRoot();
+
+        installPackage("com.android.modules.updatablesharedlibs.apps.targetS.apk");
+        installPackage("com.android.modules.updatablesharedlibs.apps.targetT.apk");
+        installPackage("com.android.modules.updatablesharedlibs.apps.targetTWithLib.apk");
+
+        runDeviceTests("com.android.modules.updatablesharedlibs.apps.targetS", null);
+        runDeviceTests("com.android.modules.updatablesharedlibs.apps.targetT", null);
+        runDeviceTests("com.android.modules.updatablesharedlibs.apps.targetTWithLib", null);
+    }
+}

javatests/com/android/modules/updatablesharedlibs/apex/Android.bp

@@ -0,0 +1,36 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+apex_key {
+    name: "com.android.modules.updatablesharedlibs.key",
+    public_key: "com.android.modules.updatablesharedlibs.avbpubkey",
+    private_key: "com.android.modules.updatablesharedlibs.pem",
+}
+
+android_app_certificate {
+    name: "com.android.modules.updatablesharedlibs.certificate",
+    certificate: "com.android.modules.updatablesharedlibs",
+}
+
+apex_test {
+    name: "test_com.android.modules.updatablesharedlibs",
+    manifest: "manifest.json",
+    file_contexts: ":apex.test-file_contexts",
+    key: "com.android.modules.updatablesharedlibs.key",
+    java_libs: [
+        "com.android.modules.updatablesharedlibs.libs.before.t",
+        "com.android.modules.updatablesharedlibs.libs.since.t",
+    ],
+    updatable: false,
+}

javatests/com/android/modules/updatablesharedlibs/apex/com.android.modules.updatablesharedlibs.pem

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

javatests/com/android/modules/updatablesharedlibs/apex/com.android.modules.updatablesharedlibs.x509.pem

@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
+MIIF8zCCA9sCFF/jvwHjBgaxHaamJyRxH88j4704MA0GCSqGSIb3DQEBCwUAMIG0
+MQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91
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+-----END CERTIFICATE-----

javatests/com/android/modules/updatablesharedlibs/apex/manifest.json

@@ -0,0 +1,4 @@
+{
+  "name": "test_com.android.modules.updatablesharedlibs",
+  "version": 1
+}

javatests/com/android/modules/updatablesharedlibs/apps/targetS/Android.bp

@@ -0,0 +1,29 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_test_helper_app {
+    name: "com.android.modules.updatablesharedlibs.apps.targetS",
+    srcs: ["UpdatableSharedLibraryTargetSTest.java"],
+    static_libs: [
+        "androidx.test.rules",
+        "androidx.test.core",
+        "truth-prebuilt",
+    ],
+    sdk_version: "current",
+    target_sdk_version: "31",
+}

javatests/com/android/modules/updatablesharedlibs/apps/targetS/AndroidManifest.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.modules.updatablesharedlibs.apps.targetS">
+  <application>
+  </application>
+
+  <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+    android:targetPackage="com.android.modules.updatablesharedlibs.apps.targetS"
+   ></instrumentation>
+</manifest>

javatests/com/android/modules/updatablesharedlibs/apps/targetS/UpdatableSharedLibraryTargetSTest.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.modules.updatablesharedlibs.apps.targetS;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import junit.framework.Assert;
+
+import com.google.common.truth.Correspondence;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.runner.AndroidJUnit4;
+
+/**
+ * Tests an app targeting S.
+ *
+ * <p>One of the shared libraries included in this test claims to be in the
+ * BOOTCLASSPATH before T so it should be added transparently to this app.
+ */
+@RunWith(AndroidJUnit4.class)
+public class UpdatableSharedLibraryTargetSTest {
+    private static String SHARED_LIB_PATH = "/apex/test_com.android.modules.updatablesharedlibs"
+            + "/javalib/com.android.modules.updatablesharedlibs.libs.before.t.jar";
+
+    private static final Context sContext = InstrumentationRegistry.getInstrumentation()
+            .getContext();
+
+    @Test
+    public void checkSharedLibrary() throws Exception {
+        String packageName = sContext.getPackageName();
+        ApplicationInfo appInfo = sContext.getPackageManager().getApplicationInfo(packageName,
+                PackageManager.GET_SHARED_LIBRARY_FILES);
+
+        assertThat(appInfo.sharedLibraryFiles)
+                .asList()
+                .contains(SHARED_LIB_PATH);
+    }
+
+    @Test
+    public void callApi() throws Exception {
+        Object api = Class.forName("com.android.modules.updatablesharedlibs.libs.before.t.Api")
+                .getDeclaredConstructor()
+                .newInstance();
+
+        String actual = (String) api.getClass().getDeclaredMethod("methodBeforeT").invoke(api);
+        assertThat(actual).isEqualTo("Success");
+    }
+}

javatests/com/android/modules/updatablesharedlibs/apps/targetT/Android.bp

@@ -0,0 +1,29 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_test_helper_app {
+    name: "com.android.modules.updatablesharedlibs.apps.targetT",
+    srcs: ["UpdatableSharedLibraryTargetTTest.java"],
+    static_libs: [
+        "androidx.test.rules",
+        "androidx.test.core",
+        "truth-prebuilt",
+    ],
+    sdk_version: "current",
+    target_sdk_version: "Tiramisu",
+}

javatests/com/android/modules/updatablesharedlibs/apps/targetT/AndroidManifest.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.modules.updatablesharedlibs.apps.targetT">
+  <application>
+  </application>
+
+  <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+    android:targetPackage="com.android.modules.updatablesharedlibs.apps.targetT"
+   ></instrumentation>
+</manifest>

javatests/com/android/modules/updatablesharedlibs/apps/targetT/UpdatableSharedLibraryTargetTTest.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.modules.updatablesharedlibs.apps.targetT;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import junit.framework.Assert;
+
+import com.google.common.truth.Correspondence;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.runner.AndroidJUnit4;
+
+/**
+ * Tests an app targeting T.
+ *
+ * <p>With the shared libraries included in this test, none of the shared libraries present in this
+ * test should be included for this app.
+ */
+@RunWith(AndroidJUnit4.class)
+public class UpdatableSharedLibraryTargetTTest {
+    private static final Correspondence<String, String> CONTAINS_SUBSTRING =
+            Correspondence.from(String::contains, "contains");
+    private static final Context sContext = InstrumentationRegistry.getInstrumentation()
+            .getContext();
+
+    @Test
+    public void checkHasNoSharedLibrary() throws Exception {
+        String packageName = sContext.getPackageName();
+        ApplicationInfo appInfo = sContext.getPackageManager().getApplicationInfo(packageName,
+                PackageManager.GET_SHARED_LIBRARY_FILES);
+
+        assertThat(appInfo.sharedLibraryFiles)
+                .asList()
+                .comparingElementsUsing​(CONTAINS_SUBSTRING)
+                .doesNotContain("com.android.modules.updatablesharedlibs");
+    }
+}

javatests/com/android/modules/updatablesharedlibs/apps/targetTWithLib/Android.bp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_test_helper_app {
+    name: "com.android.modules.updatablesharedlibs.apps.targetTWithLib",
+    srcs: ["UpdatableSharedLibraryTargetTWithLibraryTest.java"],
+    libs: [
+        "com.android.modules.updatablesharedlibs.libs.since.t",
+    ],
+    static_libs: [
+        "androidx.test.rules",
+        "androidx.test.core",
+    ],
+    sdk_version: "current",
+    target_sdk_version: "Tiramisu",
+}

javatests/com/android/modules/updatablesharedlibs/apps/targetTWithLib/AndroidManifest.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.modules.updatablesharedlibs.apps.targetTWithLib">
+  <application>
+  </application>
+
+  <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+    android:targetPackage="com.android.modules.updatablesharedlibs.apps.targetTWithLib"
+   ></instrumentation>
+</manifest>

javatests/com/android/modules/updatablesharedlibs/apps/targetTWithLib/UpdatableSharedLibraryTargetTWithLibraryTest.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.modules.updatablesharedlibs.apps.targetTWithLib;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.runner.AndroidJUnit4;
+
+/**
+ * Tests an app targeting T which also includes a shared library that is part of the BOOTCLASSPATH
+ * from T.
+ *
+ * <p>This means the shared library should not be explicitly in the shared libraries in order
+ * to avoid duplication of the BCP.
+ */
+@RunWith(AndroidJUnit4.class)
+public class UpdatableSharedLibraryTargetTWithLibraryTest {
+    // private static final Context sContext = InstrumentationRegistry.getInstrumentation()
+    //          .getContext();
+
+    @Test
+    public void checkHasNoSharedLibrary() throws Exception {
+        // TODO(b/205261027): not possible to test yet
+
+        // This is the code we'd like to run. But because before API finalisation PM
+        // will see the shared library as
+        // having "on-bcp-since 9001" this means that it never considers that shared
+        // library to be in the BCP.
+
+        // String packageName = getContext().getPackageName();
+        // ApplicationInfo appInfo = getPackageManager().getApplicationInfo(packageName,
+        //      PackageManager.GET_SHARED_LIBRARY_FILES);
+        // Log.d(TAG, "checkHasNoSharedLibrary in " + appInfo.sharedLibraryFiles.length
+        //      + " libraries");
+        // for (String path : appInfo.sharedLibraryFiles) {
+        //      if (path.contains("com.android.modules.updatablesharedlibs")) {
+        //          Assert.fail("Unexpectedly found a shared library: " + path);
+        //      }
+        // }
+    }
+}

javatests/com/android/modules/updatablesharedlibs/libs/before/t/Android.bp

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+java_sdk_library {
+    name: "com.android.modules.updatablesharedlibs.libs.before.t",
+    srcs: [
+        "Api.java"
+    ],
+    permitted_packages: [ "com.android.modules.updatablesharedlibs.libs"],
+    apex_available: [ "test_com.android.modules.updatablesharedlibs" ],
+    min_sdk_version: "Tiramisu",
+    sdk_version: "current",
+    on_bootclasspath_before: "Tiramisu",
+
+    // Output the api files to a special directory that won't trigger an API
+    // review as it is a test only API.
+    api_dir: "api_dir",
+    // Testing only.
+    no_dist: true,
+    unsafe_ignore_missing_latest_api: true,
+}

javatests/com/android/modules/updatablesharedlibs/libs/before/t/Api.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.modules.updatablesharedlibs.libs.before.t;
+
+/**
+ * Basic class to pretend we have one API.
+ */
+public class Api {
+
+    public String methodBeforeT() {
+        return "Success";
+    }
+}

javatests/com/android/modules/updatablesharedlibs/libs/before/t/api_dir/current.txt

@@ -0,0 +1,10 @@
+// Signature format: 2.0
+package com.android.modules.updatablesharedlibs.libs.before.t {
+
+  public class Api {
+    ctor public Api();
+    method public String methodBeforeT();
+  }
+
+}
+

javatests/com/android/modules/updatablesharedlibs/libs/before/t/api_dir/removed.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/before/t/api_dir/system-current.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/before/t/api_dir/system-removed.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/before/t/api_dir/test-current.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/before/t/api_dir/test-removed.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/since/t/Android.bp

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+java_sdk_library {
+    name: "com.android.modules.updatablesharedlibs.libs.since.t",
+    srcs: [
+        "Api.java"
+    ],
+    permitted_packages: [ "com.android.modules.updatablesharedlibs.libs.since"],
+    apex_available: [ "test_com.android.modules.updatablesharedlibs" ],
+    min_sdk_version: "Tiramisu",
+    sdk_version: "current",
+    on_bootclasspath_since: "Tiramisu",
+
+    // Output the api files to a special directory that won't trigger an API
+    // review as it is a test only API.
+    api_dir: "api_dir",
+    // Testing only.
+    no_dist: true,
+    unsafe_ignore_missing_latest_api: true,
+}

javatests/com/android/modules/updatablesharedlibs/libs/since/t/Api.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.modules.updatablesharedlibs.libs.since.t;
+
+/**
+ * Basic class to pretend we have one API.
+ */
+public class Api {
+
+    public String methodSinceT() {
+        return "Success";
+    }
+}

javatests/com/android/modules/updatablesharedlibs/libs/since/t/api_dir/current.txt

@@ -0,0 +1,10 @@
+// Signature format: 2.0
+package com.android.modules.updatablesharedlibs.libs.since.t {
+
+  public class Api {
+    ctor public Api();
+    method public String methodSinceT();
+  }
+
+}
+

javatests/com/android/modules/updatablesharedlibs/libs/since/t/api_dir/removed.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/since/t/api_dir/system-current.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/since/t/api_dir/system-removed.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/since/t/api_dir/test-current.txt

@@ -0,0 +1 @@
+// Signature format: 2.0

javatests/com/android/modules/updatablesharedlibs/libs/since/t/api_dir/test-removed.txt

@@ -0,0 +1 @@
+// Signature format: 2.0